Word: rotors
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Dates: during 1920-1929
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...brought from a great head by huge pipes. The residents of the vicinity were considerably disturbed by a high pitched sound which seemed to be produced by the water pipes. After thorough investigation it was found that the noise was due to the number of blades in the rotors of the turbines and their relation to the speed of propagation of vibrations through water. A mere modification of the rotor allowed the disturbed people to sleep comfortably...
...Massachusetts Institute of Technology, were the rotorists. Working with discarded materials, they had constructed a craft that differed from the original rotorship of Herr Anton Flettner of Germany (TIME, Nov. 17, Dec. 8, Mar. 2), in two respects: Where Flettner's R. S. Buckau had had two rotor cylinders, the lieutenants used but one, believing they thus avoided a detrimental interaction; where the base and top disc of the Flettner cylinder had revolved, in the U. S. design it was stationary. The motive principle was the same as Flettner's, however: the Magnus principle, that wind passing over...
...Cambridge rotorists managed, with a 12-mile breeze, to proceed at 3 knots an hour. They estimated that whereas a 10 horsepower engine would have been needed to drive their craft 6 miles an hour by propeller, the rotor and a 15-mile wind would take them 7 miles an hour with an exertion, from the put-put-put-ing motor that turned the rotor, of 1½ horsepower...
...good rotor ship Buckau, with her whirling iron towers, came to anchor in Leith harbor. She had spent approximately six days at sea, bearing a cargo from Danzig via the Kiel Canal?about three days to Kiel and three days from Kiel to Leith. Her time was not good ?tramp steamers make it in about two-thirds the time?but, during the entire voyage, she encountered storm and head winds that put her to a severe test. Moreover, during a good part of the voyage, she used her auxiliary Diesel engine...
...trip was not an unqualified success. But there are still undeveloped possibilities in the rotor principle ("TIME, Dec. 8). The greatest propelling force is obtained when the circumferential speed of the revolving towers is about 3½ times as great as the speed of the wind. The Buckau, whose revolving towers are about ten feet in diameter with a possible speed of 150 revolutions per minute can, therefore, function most efficiently in winds up to 15 miles an hour. By building rotor-ships with towers of greater diameter and greater speed of revolution, it should be possible to "sail" efficiently...